books.google.it - Incorporating significant editorial changes from earlier editions, the fourth edition of Ludwig Wittgenstein's Philosophical Investigations is the definitive en face German-English version of the most important work of 20th-century philosophy The extensively revised English translation incorporates...https://books.google.it/books/about/Philosophical_Investigations.html?hl=it&id=XN9yyyhYMDoC&utm_source=gb-gplus-sharePhilosophical Investigations